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SUMMARY The basal beds of the Speeton Clay Formation in Yorkshire and BGS Offshore Borehole 81/43, Beds E and D8 of late Ryazanian age, are in poorly fossiliferous, carbonate-free, organic-rich Kimmeridge Clay type facies. Above Bed D8 there is a rapid transition to carbonate-rich sediments with a lower organic carbon content and increasingly diverse faunal and palynofloral assemblages. In the Northern and Central North Sea basins similar coeval facies changes are represented by the Kimmeridge Clay Formation/Valhall Formation boundary.

Abstract. A new dinocyst species Mendicodinium morgenrothum is described from the Middle Jurassic, Aalenian to lowermost Bajocian Ness Formation (Brent Group) of the North Viking Graben area of the North Sea.